2-10 - Metallo
Role or Emmitt Vale worked at LexLabs where he got ahold of the Krytponite used to power Metallo

3-10 - Virtually Destroyed
Sired Jaxon Xavier and then turned him evil by disinheriting / refusing to acknowledge his existence.
Created brainwashing program Jaxon is trying to hack, using possible names for children (with Lois) as passwords.

4-17 - Vixen
Lex sired Lex Luthor Junior, screwed him up mentally by ignoring him

4-18 - Shadow of a Doubt
Lex sired Lex Luthor Junior, screwed him up mentally by ignoring him (cont.)

4-19 - Voice from the Past
A recording of Lex informs his son who Superman's alter-ego is.

VirginiaR.
"On the long road, take small steps." -- Jor-el, "The Foundling"
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"clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.