If you strip away the wild hallucinogenic mushrooms, sketchy DEA agents, and ruthless corporate hitmen, Common Side Effects still leaves you with something unexpectedly powerful: genuine friendship. At the heart of this animated conspiracy drama lies the quirky, evolving bond between Marshall Cuso and Frances Applewhite. They’re the anchor keeping fans hooked, adding depth and warmth amid all the paranoia and satire.

From High School Labs to Fugitive Adventures
Marshall and Frances aren’t exactly the pair you’d picture taking down big pharma. Marshall, a chill mycologist turned accidental revolutionary, finds himself reconnecting with Frances, his former high school lab partner. But their reunion isn’t exactly cozy—Frances now works for Reutical Pharmaceuticals, the very corporation out to crush Marshall’s dreams. Awkward.
Yet, despite this rocky start, their shared past quickly sparks an unexpected team-up. Frances initially dismisses Marshall’s wild tales about the miracle Blue Angel mushroom. After all, who could believe in a fungus that cures everything? But after witnessing its stunning effects firsthand, Frances flips sides. And that’s when their partnership really ignites.
Trust Issues: The Bumpy Road to Loyalty
Trust doesn’t exactly bloom overnight. Frances’s job at Reutical naturally makes Marshall suspicious. And Marshall’s relentless idealism seems risky, even naive, to Frances. But as the season progresses, trust slowly emerges through their shared trials. Each wild escapade, from dodging corporate spies to navigating bizarre hallucinations, tests and eventually solidifies their bond.
Key moments solidifying their friendship:
- Marshall saves Frances: Risking capture, Marshall doesn’t hesitate to help Frances during a critical raid.
- Frances’s betrayal and redemption: Initially siding with her corporate bosses, Frances soon regrets her choices, helping Marshall escape Reutical’s grasp.
- Their joint decision: Frances decisively leaves her cushy corporate life behind, choosing friendship over security.
Each event peels back another layer, revealing how deeply they’re willing to trust and rely on each other.

Banter as a Survival Skill
What’s most refreshing about these two isn’t just their evolving trust—it’s their ability to joke around amidst chaos. The banter between Frances and Marshall is razor-sharp, effortlessly balancing out tense situations. Whether poking fun at their high school selves or making dry observations about their increasingly surreal lives, humor keeps their friendship lively and relatable.
Humanizing the Absurd
The series thrives on wild, satirical scenarios mocking corporate greed and pharmaceutical ethics. But Frances and Marshall offer something real and heartfelt in this exaggerated landscape. Their relationship grounds the absurdity in genuine emotion. Watching their friendship grow amid corporate espionage and mushroom-induced visions makes viewers genuinely invested.
Fan Debates: Just Friends or Something More?
As you’d expect, fans quickly noticed the sparks flying. Online discussions exploded with theories about whether Frances and Marshall will stay platonic or if romance is inevitably in their future. Some viewers champion their bond as purely friendly, appreciating their dynamic without romantic complications. Others eagerly await any hint of deeper feelings. This ambiguity cleverly keeps everyone tuning in, hopeful and curious.
Challenges Ahead: What Will Season 2 Bring?
Their adventure is far from over. As they journey together to distribute the mushroom’s incredible benefits, new threats loom. Reutical Pharmaceuticals won’t quietly fade away, and the DEA still watches their every move. Frances and Marshall’s bond will undoubtedly face further tests. But given everything they’ve endured, we’re confident their friendship will continue to deepen.
A Mushroom-Fueled Friendship Like No Other
Marshall and Frances’s relationship remains the emotional heartbeat of Common Side Effects. Beneath its satire, conspiracies, and dark humor, their friendship genuinely resonates. Whether escaping corporate assassins or laughing at absurd hallucinations, their loyalty makes the story unforgettable. It’s rare for a show this wild to offer something so genuinely human. And it’s exactly why viewers keep coming back for more.