That '70s Show struggled to find a replacement for Eric Forman in its final season, with neither Charlie nor Randy quite hitting the mark. Charlie was too meek and Randy was too cool to fill Eric's spot in the iconic ensemble of characters. The show's finale effectively admitted that the characters of Charlie and Randy did not contribute much to the legacy of That '70s Show.

Although That 70s Show set up two different replacements for Eric Forman in its final season, the hit sitcom couldn't get either of these characters to stick. It is never easy when a beloved character leaves a successful sitcom. All TV shows rely on the chemistry between their cast members to succeed, but sitcoms are particularly vulnerable to cast shake-ups. Since sitcoms are character-driven rather than plot-focused, they tend to rely heavily on specific cast members. This was certainly true for That 70s Shows cast,...