Where the cast of Step by Step (1991-1998) is nowadays

[post_page_title]Christopher Castile – Mark Foster[/post_page_title]

Every sitcom needs a nerdy child, and that’s where Mark Foster comes into the equation. As the youngest child within the Foster family – until Lily is born, of course – there were often occasions where this youngster would be overlooked.

Christopher Castile as Mark Foster – Then

Thanks to his timid nature and his tendency to stay inside and play on his computer, his other siblings often take over as the center of attention. That doesn’t mean that fans at home didn’t fall in love with him over the years, though.

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