▁Dr . ▁Con way ▁ev ades ▁arrest , ▁but ▁is ▁murder ed ▁by ▁Jed row . ▁Lob o ▁comes ▁in ▁and ▁k ills ▁Jed row , ▁but ▁Ch amb ers ' ▁police ▁backup ▁arrive ▁soon ▁after ward ▁and ▁arrest ▁Lob o ▁and ▁Sh aron , ▁bare ly ▁saving ▁Grace ▁from ▁the ▁procedure . ▁The ▁police ▁go ▁down st airs ▁and ▁find ▁D anny ' s ▁body , ▁and ▁then ▁discover ▁a ▁men ager ie ▁of ▁be ast ly ▁men , ▁all ▁failed ▁subjects ▁of ▁Con way ' s ▁lon ge vity ▁experiments . ▁The ▁police ▁captain ▁w onders , ▁" Good ▁Lord ▁- ▁what ▁if ▁they ▁DO ▁live ▁forever ?" ▁ ▁Cast ▁ ▁John ▁Car rad ine ▁as ▁Dr . ▁Charles ▁Con way ▁ ▁My ron ▁He ale y ▁( miss pel led ▁My ron ▁He aly ) ▁as ▁Mark ▁Houston , ▁alias ▁Frank ▁Scott ▁ ▁All ison ▁Hay es ▁as ▁Grace ▁Thomas ▁ ▁Mar il yn ▁Bu fer d ▁( miss pel led ▁Mary lyn ▁Bu fer d ) ▁as ▁Dr . ▁Sh aron ▁Gil ch rist ▁ ▁Arthur ▁Bat an ides ▁as ▁D anny ▁Green ▁ ▁S ally ▁Tod d ▁as ▁Natal ie ▁And ries ▁ ▁Tor ▁Johnson ▁as ▁Lob o ▁ ▁Harry ▁Fle er ▁as ▁Harry ▁Jed row ▁ ▁Roy ▁Gordon ▁as ▁Dr . ▁Loren ▁Wright ▁ ▁Guy ▁Pres c ott ▁as ▁Police ▁Captain ▁George ▁Re agan ▁ ▁Raymond ▁G uth ▁( miss pel led ▁Raymond ▁G uta ) ▁as ▁Police ▁Officer ▁Miller ▁ ▁Paul ▁Mc Will imas ▁as ▁Police