Episode 218 "X-Men: Captive Hearts"
The X-Men discover an underground band of Morlocks, a gang of mutant misfits who perceive themselves as "too unsightly" to live and socialize among non-mutant humans, so they live in the tunnels below the city. With Scott and Jean captured, the X-Men set out to rescue them, but must also address their own safety, specifically, psychological safety.